Which block for a sea-wall?

Hi
First time posting
I need to put a sea wall at a lake in pa. We were going to use marine grade ties , but after pricing out they are coming in about the same material price as a retaining wall stone. We were leaning to versa-lok or allan. We've use the versa-lok weathered mosiac and it looked nice, but to expensive for this. Anyone done of these recently?
Thanks
Rick

They are driven in with a 300lb air hammer. Basically like pushing a stick into the ground. On that particular job, we had to be at least 10ft. below grade. It actually goes pretty good, unless you hit something of course.